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WILLIAM F. SEMPLE AND R.

W. STEPHENS, OF MOUNT VERNON, OHIO.

Letters Patent No. 88,086, dated Mal/rch 23, 1869.

DIPROVED MODE OF POLISHING HARD-RUBBER. A ND OTHER ARTICLES.

The Schedule referred to in these Letters Patent and making part of the same.

' To all whom it may conce/rn Be it known that we, VILLIAM F. SEMPLE and R. W. STEPHENS, of Mount Vernon, county of Knox, and State of Ohio, have invented a new and useful Improvement in the Manufacture of Hard Rubber, especially in the manufacture of rubber plates for dentists use; and hereby declare the following a full, clear, and exact description thereof, reference being. had to the accompanying drawing, and to the letters of reference marked thereon. y The nature of our invention consists in combining the principle ofthe usual polishing-wheel and polishingbelt, thereby obtaining the increased surface of the belt, with the solid contact and small curvature of the wheel.

The drawing is a representation in perspective of a machine, showing the embodiment of the principle ofour invention, in which- A is the polishing-belt;

B, the small wheel; and

el, the article to be polished, in the manner hereinbelow more fully set forth.

It istrue, that for purposes of polishing spokes, augers, or other articles, polishing-belts, passing over two or more wheels, or rollers, are in common use, and 'serve only in securing an elastic contact between the belt and article to be polished.

Ve are also aware, that for polishing plates for artiicial teeth, the best device now in use is the employment of a small wheel, varying in size from one-half inch to two and a half inches in diameter, and made of heavy leather; but thel great diic'ulty in this case, (and which we avoid,) is, that the friction-surtace, being so small, soon itself becomes polished, and its effectiveness .is thus destroyed.

Our improvementconsists in having the belt A run between the small wheel B and the article d to be polisbed, thus securing all the advantage of the smallest wheel, in getting into the inequalities ofthe article to be-polished, and, at the same time, have as much friction-surface as we desire-more than could possibly be obtained from the largest-sized wheel, as the belt may bc of any desired length.

Having thus fully described our invention, What we claim as new, and desire to secure by Let-` ters Patent ofthe United States, is-

The combination of the wheel and belt,so as to 0perate substantially as described.

' W. F. SEMPLE.

R. W. STEPHENS.

Witnesses: JOSEPH WATSON, ABEL HART. 

